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This clock tells time on a photochromic display

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This clock tells time on a photochromic display

Arduino TeamJuly 16th, 2019

With many LED projects—like clocks—you’ll want to use a diffuser to keep light somewhat even over a wide area. Diffusers, as their name implies, diffuse light, but what if one was to instead use it as the light source itself?

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This clever timepiece from Zaphunk does just that, employing an array of UV LEDs to illuminate a photochromic face. In the case of the glowing screen, the material first shines in response to the lit LEDs, then stays ‘on’ after they turn off, showing four numbers and a colon. When the photochromic cover is in use, the filament instead changes color based on the LEDs. 

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The clock is implemented with an Arduino Nano, an RTC module, and a heavily modified 8-digit 7-segment display, and triggered via the press of a button on top.

This clock uses a custom built 4-digit 7-segment display made from UV LEDs. In front of the display a screen is placed that consists either of phosphorescent (“glow-in-the-dark”) or photochromic material. A push button on the top lights up the UV display which then illuminates the screen for a few seconds so that it starts glowing or changes color which then slowly fades away.

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Written by Quad Oner

LEGENDS MAY SLEPP BUT THEY NEVER DIE

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